The more I've seen this, the better I've liked it - and I have watched it five or six times in the past year or so. It certainly helps when Graham Greene writes the source novel, but the performances have really grown on me - especially Alan Ladd's. He took a lot of grief for his wooden, tight-lipped style, but he nails this role - his film debut - even holding his own with trained pro Laird Creager.
The top stars were doomed. Creager died not long after this (at 31), leaving behind one of the all-time what-ifs in pictures. Ladd was for a time the #1 male draw, but the method actors post-WWII rendered his style obsolete. At least he kept working; poor Veronica Lake went from the #1 female draw of the early 40s to total obscurity by the end of the decade - washed up before the age of 30, she and Ladd both dying at the age of 50.